pretty sure the tabuki potion thing was real, what with the warning that it only lasts a night. i also liked how it said to be used as a last resort only so i'm thinking that's the last of crazy ringo.
that said, i was more surprised by yuri's reaction to the whole thing than anything. she was very composed and sympathetic of ringo. did she know that the potion lasted a day? clearly she's aware of ringo's stalking/plan which leads me to believe she may have the other half of the diary. especially since natsume doesn't have it. but that doesn't explain how yuri was always two steps ahead of ringo when she planned those curry dates, etc.
i have to say though that all of the sho x ringo positivity was kind of reversed with sho's reveal. sho thwarting ringo's fate is a GOOD thing but now that she knows sho is supposedly to "blame" for her sister's death, she may include revenge as part of her plan
either way, i'm confused how newborn babies can be at fault?
it's just cementing my suspicions that kanba's dad may have worked for kiga group, which possibly led to momoka's death, himari's isolation. i don't even think the parents are dead to be honest. it also explains kanba's involvement with them now.
finally, natsume is indeed a psycho stalker hopelessly in love with kanba--kinda a let down. but considering she's working for some penguin group, maybe kanba's her fated one? that's why she's being aggressive.
anyway good episode.